<h2>当前账号：{{admin.username}}</h2>
<table class="table" style="height: 500px;">
  <tr>
    <td  width="40%">
      <ul id="role" class="ztree" ></ul>
    </td>
  </tr>
  <tr>
    <td><input type="button" class="btn btn-primary" (click)="assignRoles()" value="分配角色组" /></td>
  </tr>
</table>
